[bug] ctrader balance bar always disappears

This is a bug which can almost always reproduce on my iPhone. After filtering history by another category, for example, changing from Today to Yesterday, ctrader balance bar will disappear, and then there is no way to get it back, even by toggling it in settings. The only way to get it back is to delete it and reinstall from App Store.

I guess this is due to the changed settings (where balance bar was toggled off) was saved by mistake, and further changes were not. A related behaviour is also observed: change plotting interval from 1min to 1day, quit the app, and open it again, sometimes the interval is still 1min, but sometimes it is changed to 1day – looks like the settings are sometimes not saved.